Process for pushing glass bottles



Nov. 22, 1932. E, ROIRANT 1,888,393

PROCESS FOR PUSHING GLASS BOTTLES Filed March 12, 1931 2 Sheets-Sheet 1 Fig.8. Fig. 2.

Evi

Nov. 22, 1932. E RolRANT 1,888,393

PROCESS FOR PUSHING GLASS BOTTLES Filed March 12, 1931 2 Sheets-Sheet 2 Fig .4. Fig .5.

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Z faimn? I Patented Nov. 22, 1932' Par r is;

Emma mm, or rams, FRANCE, ASSIGNQE rosocln'rnmomn nn'runns Er DE consrnucrrons DAPIAREILS mn canmuns POUR LA vnannnin, or PAR-IS, rnancn PROCESS FOB PUSHING GLASS BOTTLES Application filed March 12, 1931, Serial lilo. 522mm and in France April 17, 1930.

The operation mown as pushing bottles is carried out in an auxi-liary apparatus in which the blown bottle is placed on leaving 1 the finishing mould. Vain attempts have been made to avoid this supplementary ham-- dlingand operation by trymg to eifect the pushing in the finishing mould, immediately after blowing and bythe same means as that employed in the auxiliary apparatus.

It is known that these means consist in substituting for the bottom of the finishing.

in rents or cracks of the exterior surface of this push. I It will sufiice to explain the'causes of these defects to cause the process employed to eliminate them to be understoodya .process which constitutes the subject of the present invention. 3 Figures 1 and 2 represent the means known up to the present to produce the push in the finishing mould.

Figure?) shows the push thus produced and the defects that'may be noted in it.

Figures' i, 5 and 6 show the newphases of.

' pushing, the succession of which constitutes the subject of 'the present invention.

Figure 7 shows a modification of the same proposed means. if

Figure 1 shows in section the lower part of the bottleF such as it is'blown' upon the bot-,

tom 1 of the finishing mould, which may have 4 any desired profile.

' a It is afactvthat experience has always allowed to be noticed t at the thickness of the .glass forming the The central part 0 is always .much more thick than the periphery p. This anomaly is due to the blowing, which first applies centrally the glass upon the central part of the finishing bottom 1, aided in so doing by the weight, then subsequently a drawing out is produced towards the periphery, whence a continuous bottom is never regular.

- pushed bottom.

diminution of thickness and so much the more if the bottom has a large diameter.

Figure 1 shows, with guarded proportions,

the variation of thickness noticed on many occasions. L

Theblowing has equally another conse-i quence when the glass is applied to the metallic surface-of the bottom 1, the surface of the glass in contact with the metal is suddenly cooled and becomes very rigid whilst the intew 'rior surface retains to a considerable extentits original temperature.

In order to efiect the pushing there is rapidly substituted for the finishing bottom 1 a pusher 2 (see Fig. 2) having a movement in the direction of the arrow '7.

The result, shown in Fig. 8, is such that the part A B C is made thin at the end whilst 1 the periphery AD, G E, having a thickness approximately equal to the original thickness, is cracked or crackled, as indicated at 9.

These particularities are easily explainable: during the time that the pusher 2 has been substituted for the bottom 1, the central-part which is very thick and in consequence very hot has been able to reheat, in a certain measure, the corresponding exterior skin, previously cooled by the metallic contact.

When the pusher is put into action to push in the glass,it has found the central portion much more malleable than the periphery and all this central portion is stretched easily whilst the neighbouringparts have resisted 1 the traction to which they were submitted.

The exterior skin of the peripheral-region,

insufiiciently reheated, is then crackled under the effort, whence the result shown in Fig. 3. It appears therefore that these difiiculties are the consequence of the diversity of the thickness of the bottom of the bottle .(Fig. 9

1), causing a thermic diversity which does not permit the bottom of the bottle to be deformed regularly to transform it into a These are difiiculties which have necessitated the known employment of an auxiliary formity of temperature of the glass at the bottom or rather a tendency to this uniformity for the purpose of enabling the pushing to be effected in the best conditions,

It is-certain that the same result might be obtained in the finishing mould if sufficient time were allowed, but the time required is relatively considerable and the diminution of production which would follow would render prohibitive this method of working.

The present invention consists in employing means which realize, in the time available between the moment of blowing and the moment of expulsion of the bottle from the mould, the conditions required for obtaining a push free from the usual defects.

These means consist in acting at the same time upon the distribution of the glass at the bottom and regulating the temperature of this glass.-

In the first phase illustrated in Fig. 4, the bottom of the finishing mould,after it has served for blowing the bottle the bottom of which has the same defect of distribution as in Fig. 1 (thicker glass at the centre 0 than ing and to move the bottle, the object being,

in both cases, to separate the bottom'of the bottle from the bottom of the finishing mould.

Fig. 5 shows a second phase in which the bottom of the bottle, either under the action of its Weight, or under the action of a light pufi' of air, has taken the bent position indicated in this figure.

It is easily understood that for the same reasons as those which have been previously set forth, and which proved that the central hotter part was stretched towards the top under the action of the pusher, this same part is stretched downwards at 0', thus reestablishing the equality of thickness; this re-establishment depends upon the amount of separation of the bottom of the bottle from the bottom of the finishing mould.

It will be equally understood that this second phase results in a thermic action which is transferred by a new cooling of the central hotter part coming to rest upon the metallic bottom which has a cooling action, whilst the cooler outer skin of the peripheral part, tends to become heated by auto-reheating because it is no longer in contact with metal.

These particularities will therefore permit, when the pusher 2 is substituted for the finishing bottom the presentation to this pusher of a. bottom realizing the indispensable conditions for the operation of pushing and at the same time will avoid the irregular stretching and the cracks noted in the first method (see Fig. 6).

Fig. 7 shows a modification of the new cupied in this preliminary phase of pushing does notslow down the usual production and that it corresponds approximately to the indispensable time necessary for cooling, after blowing, the bottle in the interior of its mould before it is' expelled therefrom.

I claim.

1. A process of pushing bottles in the interior of a finishing mould, which consists,

after blowing of the bottle, in separating the bottom of the finishing mould and the bottom of the bottle from each other, then in allowing the central portion of the bottom of the bottle to sag and rest during a suitable period of time on thecorresponding part of the finishing bottom, in substituting the pusher for the finishing bottom,-and finally in effecting the pushing of the bottom of the bottle.

2. A process of pushing bottles in the interior of a finishing mould, which consists, after blowing of the bottle, in removing to a suitable distance the bottom of the finishing mould, leaving the bottle stationary, then in allowing the central portion of the bottom of the bottle to sag and rest during a suitable period of time on the corresponding part of the finishing bottom, in substituting the pusher for the finishing bottom, and finally in effecting the pushing of the bottom of the bottle.

3. A proces of pushing bottles in the interior of a finishing mould, which consists, after blowing of the bottle, in removing the bottle to a suitable distance, leaving the finishing bottom stationary, then in allowing the central portion of the bottom of the bottle to sag and rest during a suitable period of time on the corresponding part of the finishing bottom, in substituting the pusher for the finishing bottom, and finally in eliecting the pushing of the bottom of the bottle.

4. A process of pushing bottles in the interior of a finishing mould, which consists, after blowing of the bottle, in separating the bottom of the finishing mould and the bottom of the bottle from each other, then in allowing the central portion of the bottom of the bottle to sag by gravity and rest during a suitable period of time on the corresponding part of the finishing bottom, in substituting the pusher for the finishing bottom, and finally in effecting the pushing of the bottom of the bottle.

5. A process of pushing bottles in the in- 'terior of a finishin mould, which consists, after the blowing o the bottle, in separating the bottom of the finishing mould and the bottom of the bottle from each other, then in of;- fecting a slight blowing for causingthe central part of the bottle to sa and rest on the corresponding part of the nishing bottom, in substituting the pusher for the finishing bottom,-and finally in efi'ecting the pushing of the bottom of the bottle.

6. A process of pushing bottles in the interior offinishing mould, which consists, after blowing of the bottle, in immediately substituting the pusher for the finishing bottom, in stopping the pusher at a certain distance from thebottom of the bottle, in allowing the central part of the bottom of the bottle to sa and rest on the pusher and finally in e ecting after a suitable time the pushing of the bottom of the bottle.

7. A process for the manufacture of bottles with pushed bottom in a finishing mold, comprising finishing molds adapted to be displaced axially, characterized by the fact that after blowing the bottle in the finishing mold 1 with a flat bottom, the botom of the mold is removed to such an extent that the bottle bottom sags by reason of the softening resulting from its internal heat is only in contact through its 9entral part with the bottom of the mold brought behind so that by replacing the flat finishing mold by a pusher and b advancing this pusher, the "ushing is e ected. 8.- A 'process according to claim 7, characterized by the fact that immediately after the blowing of the bottle in the finishing mold with a fiat bottle bottom, the flat bottom of the finishing mold is replaced by a pusher at the point on which the central part of the sag- 40 ging bottom of the bottle rests whereupon b advancing the pusher, the pushing is e fected.

The foregoin specification of my Improved process or pushing glass bottles; signed by me this 27th day of February 1931. EMILE ROIRANT. 1 

